Changyoon Oh

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We consider efficient scheduling for a delay constrained CDMA Wireless Sensor Network (WSN). Given a twotiered WSN model, we first find the optimum schedule for the intra-cluster communications, that minimizes the total transmit power of the sensor nodes, while maintaining the short term average throughput at each sensor. We show that the specifics of the(More)
We consider the downlink throughput maximization problem for interference limited multiuser systems. Our goal is to characterize the optimum base station transmission strategy, i.e., whether the base station transmits to one-user (TDMA) or multiple users (CDMA). Specifically, we aim at determining the optimum number of users to be scheduled and finding the(More)
We consider the downlink throughput maximization problem for interference limited multiuser systems. Our goal is to characterize the optimum base station transmission policy (TDMA or CDMA), and find the corresponding power allocation. We model the interference by the aid of the orthogonality factor and determine the transmission strategy for a range of the(More)
Lan and Tewfik [3] have said that mobile communications and computation platforms must rely on batteries for their operation. Unlike other enabling technologies for mobile information systems, the specific energy of commercially available rechargeable batteries has improved at only about 2 percent per year over the past half century. Since frequent(More)
We consider the joint optimization problem of cell sectorization, transmit power control and multiuser detection for a CDMA cell. Given the number of sectors and user locations, the cell is appropriately sectorized such that the total transmit power, as well as the receiver filters, is optimized. We formulate the corresponding joint optimization problems(More)
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